I'm not sure if it's even easy to to in J, I'll have to think about it. Or maybe someone else can come up with an implementation?
Thanks, -- Raul On Tue, Dec 27, 2016 at 8:59 PM, bill lam <[email protected]> wrote: >> ... instead implement "all >> unmatched parenthesis", at least hypothetically. > > this is a good idea, time taken at runtime should be the same > as first unmatched, is it easy to do in C? > > Вт, 27 дек 2016, Raul Miller написал(а): >> I think we would call that the "last unmatched parenthesis". >> >> Certainly implementable, but it's not the only J-like approach. We do >> have left-to-right concepts in J (for example, NB. appears on the left >> of its comment, and conjunction arguments get bound left-to-right -- >> with nouns a, b and c, a@b@c is a@(b@c) and not (a@b)@c even though >> a-b-c is a-(b-c)). For that matter, we could instead implement "all >> unmatched parenthesis", at least hypothetically. >> >> Anyways, I do see what you are saying, but I don't know what >> importance to attach to it. >> >> Thanks, >> >> -- >> Raul >> >> >> On Tue, Dec 27, 2016 at 12:06 PM, Linda A Alvord >> <[email protected]> wrote: >> > It seems to me that this is in the spirit o J. Many uses of @ and other >> > symbols indicate to me that the writer is "thinking" from left to right. >> > If the coding of J is essentially from right to left your order feels >> > right to me. >> > >> > Linda >> > >> > -----Original Message----- >> > From: Programming [mailto:[email protected]] On >> > Behalf Of bill lam >> > Sent: Monday, December 26, 2016 7:39 PM >> > To: Programming forum >> > Subject: Re: [Jprogramming] unmatched parenthesis >> > >> > '((()' >> > shouldn't the first unmatched at index 1 instead of 0? ie use i: instead >> > of i. for unmatched (. >> > >> > >> > >> > >> > On 27 Dec, 2016 8:31 am, "Raul Miller" <[email protected]> wrote: >> > >> > Ah, good point - I was not properly handling the case where the first >> > unmatched parenthesis was the first character on the line. >> > >> > Also, the close script line is something of a special case, but it's easy >> > enough to check for: >> > >> > With that fix and this change, I'd do something like this: >> > >> > firstunmatched=:3 :0 >> > if. ')' -:&(-.&' ') y do. #y return. end. >> > q=. unquoted=. -.~:/\y='''' >> > c=. uncommented=. -. +./\ q * 'NB.' E. y >> > n=. parendepth=. +/\q*c*-/'()'=/y >> > if. 0 < {: n do. >> > (n i. _1) <. 1 i:~0 1 E. 0,n >> > else. >> > n i. _1 >> > end. >> > ) >> > >> > Thanks, >> > >> > -- >> > Raul >> > >> > >> > On Mon, Dec 26, 2016 at 7:05 PM, bill lam <[email protected]> wrote: >> >> your verb seemed to find unmatched ) only, e.g. failed for '(()' or >> >> '(()(' >> >> also a line of ) and whitespace belongs to class 'close definition' >> >> and should not be flagged as mismatch. >> >> >> >> >> >> On 27 Dec, 2016 2:42 am, "Raul Miller" <[email protected]> wrote: >> >> >> >>> I'm not sure what you mean by "containing control words" but code >> >>> readability issues are usually a call for better code. >> >>> >> >>> For this, perhaps (warning: lightly tested code): >> >>> >> >>> firstunmatched=:3 :0 >> >>> q=. unquoted=. -.~:/\y='''' >> >>> c=. uncommented=. -. +./\ q * 'NB.' E. y >> >>> n=. parendepth=. +/\q*c*-/'()'=/y >> >>> if. 0 < {: n do. >> >>> (n i. _1) <. 1+1 i:~0 1 E. n >> >>> else. >> >>> n i. _1 >> >>> end. >> >>> ) >> >>> >> >>> In other words: ignoring quoted and commented parenthesis, look for >> >>> the first occurrence of either an unbalanced right parenthesis or an >> >>> unbalanced left parenthesis. >> >>> >> >>> Let me know, though, if you see any flaws in this implementation. >> >>> >> >>> Thanks, >> >>> >> >>> -- >> >>> Raul >> >>> >> >>> >> >>> On Mon, Dec 26, 2016 at 12:57 PM, Henry Rich <[email protected]> >> > wrote: >> >>> > I don't think it is reasonable to treat ')' and 'NB.' as containing >> >>> control >> >>> > words. It makes the code very hard to read. >> >>> > >> >>> > Showing the mismatched parenthesis is important enough that it >> >>> > might be better to have it even with this deficiency, but it IS a >> >>> > deficiency and should be treated as a bug to be fixed someday. >> >>> > >> >>> > Henry Rich >> >>> > >> >>> > On 12/26/2016 11:48 AM, bill lam wrote: >> >>> >> >> >>> >> I double checked with j602, it has no problem in high lighting the >> >>> >> unmatched )( in >> >>> >> >> >>> >> a '+' ((mno - rst) % b NB. )unmatched paren >> >>> >> ^ >> >>> >> a '+' ((mno - rst) % b ')' NB. )unmatched paren >> >>> >> ^ >> >>> >> and >> >>> >> >> >>> >> '(' (=:)) >> >>> >> ^ >> >>> >> But this is matched and is correct a '+' ((mno - rst) % b ')') NB. >> >>> >> )unmatched paren >> >>> >> >> >>> >> I think it is reasonable to omit this pattern for syntax >> >>> >> high-lighting. >> >>> >> >> >>> > >> >>> > ------------------------------------------------------------------- >> >>> > --- For information about J forums see >> >>> > http://www.jsoftware.com/forums.htm >> >>> --------------------------------------------------------------------- >> >>> - For information about J forums see >> >>> http://www.jsoftware.com/forums.htm >> >> ---------------------------------------------------------------------- >> >> For information about J forums see http://www.jsoftware.com/forums.htm >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> > >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > > -- > regards, > ==================================================== > GPG key 1024D/4434BAB3 2008-08-24 > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 > gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
